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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2016

Surface-induced spin state locking of the [Fe(H2B(pz)2)2(bipy)] spin crossover complex

Résumé

Temperature- and coverage-dependent studies of the Au(1 1 1)-supported spin crossover Fe(II) complex (SCO) of the type [Fe(H2B(pz)2)2(bipy)] with a suite of surface-sensitive spectroscopy and microscopy tools show that the substrate inhibits thermally induced transitions of the molecular spin state, so that both high-spin and low-spin states are preserved far beyond the spin transition temperature of free molecules. Scanning tunneling microscopy confirms that [Fe(H2B(pz)2)2(bipy)] grows as ordered, molecular bilayer islands at sub-monolayer coverage and as disordered film at higher coverage. The temperature dependence of the electronic structure suggest that the SCO films exhibit a mixture of spin states at room temperature, but upon cooling below the spin crossover transition the film spin state is best described as a mix of high-spin and low-spin state molecules of a ratio that is constant. This locking of the spin state is most likely the result of a substrate-induced conformational change of the interfacial molecules, but it is estimated that also the intra-atomic electron–electron Coulomb correlation energy, or Hubbard correlation energy U, could be an additional contributing factor.
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Dates et versions

hal-01314476 , version 1 (27-01-2021)

Identifiants

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Sumit Beniwal, X. Zhang, Sai Mu, Ahmad Naim, Patrick Rosa, et al.. Surface-induced spin state locking of the [Fe(H2B(pz)2)2(bipy)] spin crossover complex. Journal of Physics: Condensed Matter, 2016, 28 (20), pp.206002. ⟨10.1088/0953-8984/28/20/206002⟩. ⟨hal-01314476⟩
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